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			<h1>common_schema</h1> <strong>2.2</strong> documentation
			<div class="subtitle">DBA's framework for MySQL</div>
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				<h2><a href="slave_status.html">slave_status</a></h2>	
<h3>NAME</h3>
slave_status: Provide with slave status info 
<h3>TYPE</h3>
View

<h3>DESCRIPTION</h3>
<p></p>

<p>
	<i>slave_status</i> displays minimal information about this server's slave status.
	Its information is generally a subset of <strong>SHOW SLAVE STATUS</strong>. 
</p>

<p>
	A problem with MySQL's <strong>SHOW SLAVE STATUS</strong> is that it cannot be read
	nor used on server side; one cannot open cursor on this statement. The
	<i>slave_status</i> view attempts to provide with as much info (though minimal)
	about the status of replication. In particular, the 
	<strong>Seconds_Behind_Master</strong> value is provided by this view.  
</p>

<p>
	<strong>NOTE</strong>, this view is experimental.
</p>

<h3>STRUCTURE</h3>

<blockquote><pre>
mysql&gt; DESC common_schema.slave_status;
+-----------------------+---------------+------+-----+---------+-------+
| Field                 | Type          | Null | Key | Default | Extra |
+-----------------------+---------------+------+-----+---------+-------+
| Slave_Connected_time  | decimal(32,0) | YES  |     | NULL    |       |
| Slave_IO_Running      | int(1)        | NO   |     | 0       |       |
| Slave_SQL_Running     | int(1)        | NO   |     | 0       |       |
| Slave_Running         | int(1)        | NO   |     | 0       |       |
| Seconds_Behind_Master | decimal(32,0) | YES  |     | NULL    |       |
+-----------------------+---------------+------+-----+---------+-------+
</pre></blockquote>

<h3>SYNOPSIS</h3>

<p>Columns of this view:
	<ul>
		<li><strong>Slave_Connected_time</strong>: Number of seconds this slave has been connected to its 
			master, or <strong>NULL</strong> if not connected.
		</li>
		<li><strong>Slave_IO_Running</strong>: <strong>1</strong> if the slave I/O thread is currently running, <strong>0</strong> otherwise.</li>
		<li><strong>Slave_SQL_Running</strong>: <strong>1</strong> if the slave SQL thread is currently running, <strong>0</strong> otherwise.</li>
		<li><strong>Slave_Running</strong>: <strong>1</strong> if both IO and SQL threads are running, <strong>0</strong> otherwise.</li>
		<li><strong>Seconds_Behind_Master</strong>: number of seconds this server is lagging behind its master, 
		or <strong>NULL</strong> if not replicating.</li>
	</ul>
</p>


<h3>EXAMPLES</h3>
<p>Get slave status on a replicating slave:

<blockquote><pre>mysql&gt; SELECT * FROM slave_status \G
*************************** 1. row ***************************
 Slave_Connected_time: 82077
     Slave_IO_Running: 1
    Slave_SQL_Running: 1
        Slave_Running: 1
Seconds_Behind_Master: 5
</pre></blockquote>

In the above the slave is lagging <strong>5</strong> seconds behind its master. Otherwise,
replication is up and running.
</p>

<h3>ENVIRONMENT</h3>
MySQL 5.1 or newer. 

<h3>SEE ALSO</h3>
<a href="processlist_repl.html">processlist_repl</a>,
<a href="processlist_top.html">processlist_top</a>

<h3>AUTHOR</h3>
Shlomi Noach
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